PDF malware analysis — malicious · aecac9639229c748

MALICIOUS

PDF

125.3 KB Created: 2021-08-02 04:27:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07

MD5: e2e2e075df2c71850ddf838c43931a15 SHA-1: 3862fb00a50682ee402b420c7755608347c3fb3e SHA-256: aecac9639229c7484711d64b9617f33d28d8181e6c36a017c1c3bee34614b92a

204 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious File

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. The 'SE_CLICKFIX' heuristic indicates the document attempts social engineering by instructing the user to press Win+R or paste a command, likely to bypass macro restrictions and execute a payload. The 'SE_DOWNLOAD_BUTTON' heuristic further suggests a lure to download a malicious file.

Machine Learning

Nyx PDF Classifier malicious score 0.9934

Heuristics 8

ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
ClickFix social engineering attack high SE_CLICKFIX

Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM

PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM

Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON

Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
External URI info PDF_URI

PDF contains an external URL action
Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL

The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
Embedded URL info EMBEDDED_URL

One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
URL http://chnli.tw/CKEdit/upload/files/25342376532.pdf In PDF document text
- https://www.kbstephens.com/wp-content/plugins/super-forms/uploads/php/files/6edf508839fe192a65711b23f429c8cb/95523122785.pdfIn PDF document text
- https://habibitours.net/ckfinder/userfiles/files/kosukefipokojozo.pdfIn PDF document text
- https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/7892f6e8ed80e308c19bd3e9169377af/fenebozomogaxajewuge.pdfIn PDF document text
- https://www.hemoroidklinigi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9f0c5e012---11099145306.pdfIn PDF document text
- http://zge-led.com/luodan/images/userfiles/file/wurapobuzi.pdfIn PDF document text
- https://www.northernillumination.com/wp-content/plugins/super-forms/uploads/php/files/7ca57eac6963b547c60f29bf085b389d/zilojigekojowubebimo.pdfIn PDF document text
- http://insidethedigitaltrend.biz/userfiles/file/fukabixajuk.pdfIn PDF document text
- https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/e4b2e7b48c129149aaaadc4e1babd6bf/13999427812.pdfIn PDF document text
- http://bestbuyfromindia.com/userfiles/file/kipodexotuma.pdfIn PDF document text
- https://dynasty888.com/image/files/20210703_192949.pdfIn PDF document text
- https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/c64059e9cf6f36034d75cc32974917eb/tagakekepifa.pdfIn PDF document text
- http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160851e1edab3b---40888741936.pdfIn PDF document text
- https://carstenrath.com/wp-content/plugins/super-forms/uploads/php/files/htgtr2thgfb4m0rjvt8a163qp8/dipilegalotibowar.pdfIn PDF document text
- https://ols.lighting/wp-content/plugins/super-forms/uploads/php/files/f3f4088a2fdd62ad5ee32d6a1e02b0cc/96028045443.pdfIn PDF document text
- http://yangs-ns.com/ckfinder/userfiles/files/20210724000515.pdfIn PDF document text
- http://srihemkuntsahibfgp.org/hemkunt/userfiles/file/xewolusarekagajapemorez.pdfIn PDF document text
- http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b661d6e194f---xurabaf.pdfIn PDF document text
- https://dannysacademy.com/ckfinder/userfiles/files/30896312913.pdfIn PDF document text
- http://hoteldazegliotorino.com/userfiles/files/ragunewuruzoxuk.pdfIn PDF document text
- http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b23684859cf---tuxanozusomegog.pdfIn PDF document text
- https://doublehair.center/upload/ckfinder/files/fozoxunipuruvibetosut.pdfIn PDF document text
- http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160862e8695fe3---nigodomomobik.pdfIn PDF document text
- http://camionespanamericana.com/userfiles/file/zoxobujotogewaxexe.pdfIn PDF document text
- http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/4fc6pfm95ccpaoner5rgl5igs6/sukatujawiworazuniduk.pdfIn PDF document text
- https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/0o4t7qqef0ig9fv75hnu2sh1s0/tojijoferekamexup.pdfIn PDF document text
- https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607aa541c7dd2---51187926332.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=xforce+keygen+autocad+2013+mac+downloadPDF link annotation
- http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
- http://purl.org/dc/elements/1.1/In PDF document text
- http://ns.adobe.com/pdf/1.3/In PDF document text
- http://ns.adobe.com/xap/1.0/In PDF document text
- http://ns.adobe.com/xap/1.0/mm/In PDF document text
- http://ns.adobe.com/xap/1.0/rights/In PDF document text
- http://dejavu.sourceforge.netIn PDF document text
- http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off00018294.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x18294	11424 bytes
SHA-256: `467c9f1f92cb5b6061ca5bfe2efad86682b3e4ac2f92f53b4c5e4d2acf79c93d`
`font_01_sfnt_off00019d96.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x19D96	18276 bytes
SHA-256: `55d4b9f89a55863c7e60758169ce5f52fbeeed16d1c0115c675bc8ba835e08a3`
`font_02_sfnt_off0001ce27.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1CE27	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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